John m



2 sheets-.sheet 1.

(NO Model.)

J. M. CASE.

GRINDING MILL. M No. 297,756. pr. 29'. 1884.

3 Patentgd A llll (No Model.) 2 Sheets-Sheet J. M. CASE.

GRINDING MILL. A No. 297,756. Patented Apr. A29, 1884.

JOHN M. CASE, OF COLUMBUS, OHIO, ASSIGNOR TO THE OASE' MANUFAC- TURING COMPANY, OF SAME PLACE.

GRl-NDNGFMILL.

SPECIFICATIN forming part Of Letters Patentlo. 297,756, :lated April 29, 1884.

v Application filed May 31, 1883. (No model.)

fo @ZZ whom t may concern..-

Beit known that I, JOHN M. OASE, a citizen of the United States, residing at Columbus, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Grinding-Mills, ofwhich the following is a specification.

rllhe subject of my invention is a grain breaking or reduction machine constructed with a pair of revolving grinding-rolls working against the opposite faces of a stationary plate interposed between them and extending above and below the horizontal plane ot' their axes, as hereinafter described. The interposed plate is adjustable vertically by means" of one or more screws, so as to bring the ditferent parts of its surface into action between the rolls, and it is furthermore provided with clamp-bolts for securing it in any position in which it may be set. The interposed grinding-plate consists of a frame or back, to which are screwed surface plates, which may be either smooth or corrugated. I prefer to employ one smooth and one corrugated surface or grinding-plate on the respective sides or faces. Between the surface-plates and the framg or back to which they are attached are interposed'packings of rubber or like yielding material, to take up the jar and prevent noise. By extending the grinding-plate above and below the grinding-surfaces of the rolls, the machincis divided into two separate and distinct compartments, and I am thus enabled to providea gradual-reduction machine which is adapted to act successively on the material,

suitable conveyers, elevators', and feed mechanism being employed.

In order that my invention may be fully' aindeistood, I will proceed to describe it with referenceto the accompanying drawings, in

which- Figure 1 is a vertical transverse section of a machine illustrating my invention, on the line 1 1, Figs. 2 and 3. Fig. 2is a horizontal section of the same on the line 2 2; Figs. 1 and 3. Fig. 3 is a vertical longitudinal section on the line'3'3, Figs. 1 and 2. Fig. 4is aperspective view of the interposed grinding-plate removed. y

1 and 2 represent revolving grinding-rolls corrugated with teeth of different sizes, and mounted in adjustable bearings, such as hereinafter described, adapted to crush the grain against the respective faces of a grindingplate interposed between them and extending above and below the horizontal plane of their vaxes.

j ustable vertically by means of a screw, 5, resting by a collar near its upper end on a boss on the top of the frame, and provided at the top with ahand-wheel or key-square for turning it. Clamp-bolts 6 6, oassing through holes in lugs 11, formed on the frame-1,0, and

.The interposed grinding-plate is adthroughvertical slots in the casing 3, and red rceiving nuts on their outer ends, iix the plate in any position in which it may be set.

v The interposed grinding-plate is preferably constructed of surface-plates 4 4, removably secured by bolts 9 to a central frame or back, 10, in which the adjusting-screw 5 is threaded, and on which are formed the lugs 11, for receiving the clamp-bolts 6.

lBetween the surface-plates 4 and and the central frame or back,10,are interposed cushions or packings 12, of rubber` or like yielding material, for the purpose of taking `up the jarfr'om the rolls and preventing noise.r It is obvious, however, that this interposed grinding-plate may be made solid without departing from my`invention.

By the employment of two adjustable grinding-rolls crushing against the opposite faces of a stationary grinding-plate interposed between them, and extending for a suitable distance above and below them, I am enabled to effect two successive breaks or reductions of the material, said plate serving as a partition for dividing the machine into two separate and independent compartments. interposed plate, therefore, is' made to do the work of an additional pair of rolls, and the cost of making it is materially less. portant advantage is that by the use of such a grinding-plate a machine of the capacity of a four-roller mill may be made, occupyingalittle more than one-half the space.

It is found advantageous to employa smooth plate, 4, for the first break-roll, 1, to work against, and a corrugated plate, 4", forthe second break-roll, 2.

The use of the Another im-` IOC The feed-hoppers 13 may be of any suitable construction, and may be provided with customary regulating slides, 14. If preferred, I may employ a vibrating feed-box such as I have described in my application No. 96,699, of even date herewith.

15 15 represent doors for inspecting` the feed, and 16 16 doors for inspecting the material de livered from the respective rolls.

rIhe means for adj usting the distance asu nder ofthe rolls and leveling them I have described and claimed in my application No. 96,699, above referred to. The adjusting device consists of links 17, secured at one end to the boxes 1S, and having at their other ends adjusting-screw followers 19, which bear against the eccentric ends 2O of a transverse shaft, 21, which is anchored to the case 3. This constitutes the means for holding them at the proper distance asunder. A spring (not here shown) is placed underneath each of these links, and bears at one end against the box 18 and at the other end against a iixed lug on the case, for holding the rolls in proper grinding position with a yielding pressure.

The lower part of the case is formed with two delivery-spouts. 7 8, for receivingthe material from the respect-ive rolls 1 2.

Having thus described my invention, the following is what I claim as new therein and desire to secure by Letters Patent:

1. In a grain breaking or reducing machine, the combination of a pair of grinding-rolls and a stationary grinding-plateinterposed between said rolls and extending` above and belowthe horizontal plane of their axes, as and for the purpose setI forth.

2. 1n a grain breaking or reducing machine,

the combination of a pair of grinding-rolls f and a stationary grinding-plate havingparallel faces interposed between said rolls and extend ing above and below the horizontal plane of their axes.`

3. In a grain breaking or reducing machine, the combination, with a pair of rolls and a grinding-plateinterposedbetween the adjacent faces of said rolls and extending above and below the horizontal plane of their axes, of means for adjusting said plate vertically, as set forth.

4. In a grain breaking or reducing machine, the combination, with apair of rolls, a grinding-plate interposed between said rolls and extending above and below the horizontal plane of their axes, and means for adjusting said plate vertically, ofmeans forlocking it in anypositionin whichit may be set,as described.

In a grain breaking or reducing machine, the combination, with a pair ot'grinding-rolls anda stationary grindingplate interposed between the adjacent faces of said rolls and extending above and below the horizontal plane of their axes, of means for adjusting thc distance asunder of the rolls.

6. In a reduction-maehine, the combination, with two rolls, ofa grinding-plate for use between them, constructed ot'aeentral frame and removable face or grinding-plates, as set forth.

7. In a reduction-machine, the combination, with two rolls, of a grinding-plate for use between them, constructed ot' a central frame, removable face or grinding-plates, and suitable elastic packing interposed between said plates and frame, as set forth.

8. In a gradual-reduction machine, t-he combination o1" casing 3. hopper-spouts 13 13, rolls 1 2, interposed grinding-plate, and deliveryhoppers7 S, allconstructed and arranged substantially as herein shown and described.

JOHN M. CASE.

XVitiiesses:

OctriiviUs KNIGHT, HARRY E. KNIGHT. 

